/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.socket;

import java.util.EnumSet;

import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.ServletContext;

import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.NetworkConnector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

/**
 * Jetty based {@link WebSocketTestServer}.
 *
 * @author Rossen Stoyanchev
 * @author Sam Brannen
 */
public class JettyWebSocketTestServer implements WebSocketTestServer {

    private Server jettyServer;

    private int port;

    private ServletContextHandler contextHandler;


    @Override
    public void setup() {
        // Let server pick its own random, available port.
        this.jettyServer = new Server(0);
    }

    @Override
    public void deployConfig(WebApplicationContext wac, Filter... filters) {
        ServletHolder servletHolder = new ServletHolder(new DispatcherServlet(wac));
        this.contextHandler = new ServletContextHandler();
        this.contextHandler.addServlet(servletHolder, "/");
        for (Filter filter : filters) {
            this.contextHandler.addFilter(new FilterHolder(filter), "/*", getDispatcherTypes());
        }
        this.jettyServer.setHandler(this.contextHandler);
    }

    private EnumSet<DispatcherType> getDispatcherTypes() {
        return EnumSet.of(DispatcherType.REQUEST, DispatcherType.FORWARD, DispatcherType.INCLUDE, DispatcherType.ASYNC);
    }

    @Override
    public void undeployConfig() {
        // Stopping jetty will undeploy the servlet
    }

    @Override
    public void start() throws Exception {
        this.jettyServer.start();
        this.contextHandler.start();

        Connector[] connectors = jettyServer.getConnectors();
        NetworkConnector connector = (NetworkConnector) connectors[0];
        this.port = connector.getLocalPort();
    }

    @Override
    public void stop() throws Exception {
        try {
            if (this.contextHandler.isRunning()) {
                this.contextHandler.stop();
            }
        }
        finally {
            if (this.jettyServer.isRunning()) {
                this.jettyServer.setStopTimeout(5000);
                this.jettyServer.stop();
            }
        }
    }

    @Override
    public int getPort() {
        return this.port;
    }

    @Override
    public ServletContext getServletContext() {
        return this.contextHandler.getServletContext();
    }

}
